Abrasive-wheel mount



Dec. 2,1930. 'r. LARSSON ABRASIVE WHEEL MOUNT Filed June 30, 1927 Witnesses flare larva/2 Patented Dec. 2, 1930 UNITED STATES PATENT OFFICE TEUIBE LAB SBON, OI WORCESTER, MASSACHUSETTS, ASSIGNOR TO NORTON COMPANY,

, OF WORCESTER, MASSACEUSETTS, A. CORPORATION OF MASSACHUSETTS ABIR.ASIVIEl-WHEEL MOUNT Application filed June 30, 1927. Serial 1T0. 202,674.

y invention relates to abrasive wheels and more particularly to a mount for an 1 abrasive annulus, which may be ma e up of se 1w ents secured together.

I ode'rn methods of grinding require large, rapidly rotated grinding wheels, and since such wheels cannot be made ordinarily as a monolithic structure it is now proposed to make such wheels of segments. One of the problems inherent in usin a segmental wheel is that the segments mastic mounted ri 'dly and securely upon the grinding wheel spmdle and held together as a unitary integral body. It is the primary object of this invention to provide a segmental wheel which is so constructed and arranged that it may be manufactured in the grinding wheel plant and shipped to the oint of use and there assembled readily an securely upon a mount of simple construction.

A further object of my invention is to rovide a wheel supporting structure whic is capable of supporting an abrasive annulus, whether made as a monolithic structure or of segments arranged in the desired position, and to provide a very simple and effective manner'of mounting such an abrasive body securely upon a grinding wheel spindle.

Referring to the drawings which illustrate one embodiment of my invention and in which like reference numerals indicate like arts: P Figure 1 is a side elevation of a grinding wheel mounted on its supporting platesbut with a portion of one plate broken away;

Figure 2 is a fragmentary section through one of the segments and the supporting plates; and

Figure 3 is a perspective view of one of the segments ready for assembling m'the wheel structure. ,1

As shown in the drawings, I provide. an

' abrasive annulus 'withspaced openings in which are fitted supporting members adapted to be mounted on the grinding wheel spindle. The openings may be grooves in the side faces of the wheel but preferabl comprise perforations through the abrasive ody. The interfitting members, if perforations are used and if they are round, are shaped as pins arpreferably adjusted into position so that they engage the ends of the pins or the segments and clamp the segments rigidly in position. If the abrasive wheel is made up of individual segments instead of a monolithic abrasive structure, I preferably provide a cementitious material, such as sulfur or a metal of a low melting point, which is placed in the crevices between the ends of the segments and serves to secure the segments into a unitary, integral, rigid, annular abrasive body capable of being assembled in the factory and shi ped to the point of use in such condition, a er which it may be mounted on the supporting plate orvother suitable means as desired.

'Referring more particularly to the drawings, which show an abrasive wheel made of segments of abrasive assembled in the form of an an'nulus, these segments 10 may be shaped so as to provide, when assembled, an

'outer convex grinding surface 11, side faces 12, end faces 13 and an inner concave face 14. In order that the clamping and supporting plates may be, located within the planes formed by the side faces of the abrasive annulus, the inner portion of each segment is preferably reduced in size to form the recesses 17 within which such plates maybe located. Various shapes of supporting members may be utilized, but as illustrated they may comprise simply two disk shaped plates 20 and 21 which are provided with suitable apertures 22 adapted to be mounted on the grinding wheel spindle.

In order t9 mount the abrasive annulus rig idly on these plates, the inner reduced portion 16 of the annulusis provided with spaced apertures, which are so shaped and arranged that they will fit upon the supporting pins 25 carried by the plates 20 and 21. These pins are preferably cylindrical in shape at their supporting portions and'in order that the abrasive annulus may be mounted rigidly in place, I prefer to secure bushings 26 within the apertures which are shaped and sized' to fit snugly against thecylindrical surfaces of the pins 25.

As one manner of putting these bushings in place so that they may coincide exactly in position with the pins on their supporting plate, I may mount the various bushings on locating pins of a fixture which is correctly shaped to position each bushing centrally within its aperture in the abrasive body. Thereafter, a suitable cementitious material 27 ,such as molten lead or Babbitt metal, may be poured in the space surrounding the bushing in each aperture, and this molten material flows into 'the surface pores of the abrasive body and unites firmly with the bushing and thereby holds it rigidly and securely in position.

The supporting pins 25 are mounted in the plates 20 and 21 in such a manner that the plates may be adjustably drawn toward each other to hold the abrasive annulus rigidly in position. For this purpose, the ends of the bushing 26 in the abrasive body are made to project slightly beyond the outer faces of the body, so that the clamping plates will engage the ends of the bushing and not contact with the abrasive material, since otherwise the clamping pressure might serve to crush the abrasive body. A simple way of fastening the pins to the plates is shown in the drawings. The right hand end of each pin is threaded into the plate 21, and the other end projects loosely into an opening 28 in the 'plate 20 and is secured in position by means of a nut 29 secured on the end of the pin. It can therefore be seen thatif the pins fit accurately within the bushing 26 and if the pins are properly positioned in the two plates, the plates may be drawn tightly against the ends of the bushings 26 add the abrasive ring will be held ri idly and securely in position.

If the w eel is to be made up of individual segments, the segments may be shaped as clearly shown in Fi 3. Each segment is' provided with a pa oration and preferably two for mounting on the pins 25. If desired, and as is preferable, a cementitious material, such as sulfur, is flowed into the crevices between the end faces 13 of the segments so that any peripheral thrust on one segment will be absorbed by other segments and the whole wheel will be an integral structure. It is also preferable to assemble the segments in the shape of an annulus before mounting on the clamping plates, and in this case I cement them together'so as to form a rigid, unitary structure', which may be shipped in that form and later mounted on the clamping plates where they are to be used. To that end, the segments are placed properly in position, slightly apart, and molten metal or other suitable cementitious material is poured into the crevices. This flows into the surface pores and makes a firm contact with the segments so as to hold them securely together.

It will therefore be seen that, by this arrangement, I have provided a simple but effective manner of making a segmental wheel and of mounting an abrasive annulus on a rotatable support. Various modifications of the form shown will be readily apparent and the invention is to be interpreted broadly within the scope of the appended claims;

Having thus described my invention what I claim as new and desire to secure by Letters Patent is I 1. A grinding wheel comprising an abrasive body having a series 0 opemngs in its side faces and a bushing in each openin having a surface accurately preformed to t correctly on a supporting member which is removably insertable in said openin whereby the abrasive body may be mount on a support located at the side of the wheel.

2. A grinding Wheel comprising an abrasive body having openings in its side faces,

a preformed bushing in each opening, and

cementitious material securing the bushing within said opening in the abrasive body and locating it correctly, said bushing having an accurately shaped internal face which fits on the locating pinof a support.

3. A grinding wheel comprising 'an annulus of abrasive segments arranged to form a peripheral grinding surface and having two side faces, each segment having two spaced openings therein, a' bushing located in each said openings which is integral with the abrasive segments and has an accurately preshaped surface adapted to be mounted on a supporting member which removably fits therein.

4. A grinding wheel comprising an annulus of abrasive segments which has a grinding face and side faces, each segment having an opening extending therethrough from one side to the other, a preformed bushing having an internal surface accurately positioned in each of said openings, and a mount for said abrasive annulus comprising a support and pins on the support removably insertable into the bushin s which have surfaces shaped accurately to t within said bushings and thereby position the segments correctly.

5. A grinding wheel comprising an abra-.

sive body having a recessed side face and laterally extending openings, bushings having accurately shaped internal faces positioned correctly within the openings,a supporting member removably located in the recess and a series of pins mounted on the member whichremovably fit in the bushings.

6.- A grinding wheel comprising an abrasive body having a grinding face and side faces provided with openings therein, a

preformed bushing in each opening which.

- ried by the plates which are removably insertable into the bushings and locate the body correctly, and means for drawing the plates towards each other to secure the abrasive body therebetween.

8. A grinding wheel comprising an abrasive body having a grinding face and side faces provided with openings therein, bushings' fixed in said openings which have preshaped faces, a series of locating members which removably fit into said bushings, and clamping members associated therewith which engage only the ends of the bushings and clamp the same therebetween.

9. A grinding wheel comprising an abrasive body having a peripheral grinding face,

side faces and openings inits side faces, a preformed bushing in. each opening which projects outwardly beyond the side of the abrasive body, said bushing having an accurately shaped internal surface, clamping supports engaging only 'the projecting ends of the bushings, and pins carried by said supports which are removably insertable into and fit accurately withinthe bushings and thereby locate the abrasive body correctly.

10. A grinding wheel comprising abrasive segments arranged as an annulus, cementitious filler between the segments which forms a, unitary structure thereof, each segment having an opening therein, and bushings in the openings which have correctly located accurately preformed faces adapted to receive and fit against supporting members removably assembled therewith.

11. An abrasive segment comprising a body of bonded abrasive grains which is shaped to be mounted with similar bodies to form an abrasive annulus, said segment having side faces and an opening therein, and a bushing secured in the opening which has an accurately located preformed surface capable of being removably mounted on a supporting member.

Signed at Worcester, Massachusetts, this 29th day of June, 1927.

THURE LARSSON. 

